In Trainz 2006, some UK buffers did stop trains overshooting the buffers and leaving the track, but you had to be doing less than 5 mph for this to occur, any faster and you would overshoot the buffer, and end up with a derailed train...
It would be nice if they made the buffers stronger, so they can stop slightly faster trains, I don't mean stop a 100mph express, as this could never happen in real life, but to be able to stop a small freight at say 30mph or so, in a freight or goods yard...
Joe Airtime